According to what others had comments, the range/coverage and throughput are not as great as Asus.
Had setup the AC Time Capsule(Main Router) and AEBS(Extended Mode) for my BIL in his 4-bedder unit, overall wifi ok lah, definitely have to separate 2.4Ghz & 5Ghz broadcast cos combining both signal as 1 SSID, wifi fluctuate very badly.
Generally, AEBS are easy to setup but lacks customisation. If I remembered correctly, the AC model doesn't even allow you to choose radio mode also.
The reason he bought the above is just for simple setup and also he wanted a complete Apple Eco-system to run in his place.
